(08-23) 20:44 PDT OAKLAND -- A 38-year-old man died early Saturday after he was shot multiple times during a Wiz Khalifa concert at the Shoreline Amphitheater late Friday night, police said.

The man, whom police did not identify, died after he was shot in the backstage area of the large venue and was then rushed to a hospital, police said.

Police received several calls at 11:05 p.m. that pistol shots had been fired. No arrests have been made, and police are searching for a suspect described as a black male between 5 feet 6 and 5 feet 8 with short hair. He was wearing a red baseball cap and is believed to be in his 20s.

Police also asked that anyone who may have taken pictures or video contact investigators.

"We are looking for anyone who has any video or photographs from around the time of the shooting," said Shino Tanaka, a spokeswoman for the Mountain View Police Department. "We are hoping that someone may have captured what happened."

Pittsburgh rapper Wiz Khalifa announced Saturday that he would cancel that night's performance in Chula Vista (San Diego County).

A post on Wiz Khalifa's Twitter account blamed the cancellation on "a situation out of our control."

The rapper wrote that the shooting was "a senseless tragedy."

"Violence is never the answer," he tweeted. "My prayers go out to the victim's family."